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Ground Circuits

  1. Turn ignition off. Locate PCM. See POWERTRAIN CONTROL MODULE LOCATION table. Using a DVOM, check continuity between ground and PCM connector pins. See IDENTIFYING PCM GROUND PINS  table. See Figure and Figure. If continuity does not exist, repair open ground circuit as necessary. If continuity exists, go to next step.
    IDENTIFYING PCM GROUND PINS

    Application PCM Ground Pin No.
    Continental, Crown Victoria, Grand Marquis & Town Car 3, 25, 51, 77 & 103
    Contour, Cougar & Mystique 24, 51, 77 & 103
    Econoline
      4.2L & 4.6L 24, 25, 51, 76, 77 & 103
      5.4L 3, 24, 25, 51, 77 & 103
      6.8L 3, 23, 24, 25, 51, 76, 77 & 103
    Expedition & Navigator 3, 25, 51, 77 & 103
    LS A24, A25, A26 & A27
    Mustang 24, 25, 51, 76, 77 & 103
      3.8L 24, 25, 51, 76, 77 & 103
      4.6L 2-Valve 3, 25, 51, 77 & 103
      4.6L 4-Valve 25, 51, 77 & 103
    Pickup
      F150 & F250
        4.2L & 4.6L 24, 25, 51, 76, 77 & 103
        5.4L 3, 25, 51, 77 & 103
      Super-Duty Models 3, 23, 24, 51, 76, 77 & 103
    Ranger 24, 25, 51, 76, 77 & 103
    Sable & Taurus 24, 25, 51, 76, 77 & 103
    Windstar
      3.0L 24, 51, 76, 77 & 103
      3.8L 24, 25, 51, 76, 77 & 103
  2. Touch negative lead of voltmeter to a good ground. With vehicle running, backprobe positive lead of voltmeter to each ground terminal. Voltmeter should indicate less than one volt. If reading is greater than one volt, check for open, corrosion or loose connection on ground lead.
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